| 摘要 |
The undervoltage tripping device has an electromagnet with a magnet winding (3), a core (10) and an armature (20) and a tripping member (50) able to perform a tripping movement. In the ready-to-trip state the armature is in an attracted position on the core, is spring loaded in the dropping direction, but is prevented from dropping from the core by the magnetic force of attraction produced by the electromagnet. The tripping member is also spring loaded in this state, but is prevented from performing the tripping movement by the attracted armature. The electromagnet is a d.c. magnet. A rectifier is provided for rectifying the current flowing through magnet winding. Mechanical aids are provided for feeding the armature into the attracted position. The tripping member is latched in self-release manner in the ready-to-trip state. The latching effect is released when the armature drops.
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